Morning Gents. Following is a YouTube link of truck going down the road. Speed dependent tick/knock. Started happening after I installed water/meth injection and wasnt smart enough to dial timing way back. Since symptoms manifested I've redone valve lash, retorqued exhaust manifold bolts and both hotside turbo mounts. I'm not sure where to go from here, truck still has power, rod bearing on the way out? Really appreciate any insight. 

 

https://youtu.be/YgKtf61n9iE

Kind of does sound like a rod bearing, but before I say that for sure, I would check bearings on everything that's driven by serpentine belt. I have a fan one time that alternator bearing went out and made sound just like that. Could also be maybe torque converter loose or something along them lines. Basically hopefully something simple.

 

Edit 

Maybe just take serpentine belt off and drive it a little bit, just remember you have no cooling or charging

Edited August 3, 20187 yr by Dieselfuture

One truck I had looked at had similar knock we figured bearings but turned ou damaged rist pin and piston in either 5 or 6.

It's definitely in the bottom end.  Is there a specific rebuild kit anyone recommends?  Which pistons and rods?  I appreciate all your input.